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When the caster recites the incantation, the spell is initiated, resulting in several orbs of light gathering around the location of the target. The lights then converge with tremendous force upon the target.

Survey the Heaven, Open the Heaven...All the stars, far and wide...Show me thy appearance...With such shine.O Tetrabiblos... I am the ruler of the stars...Aspect became complete...Open thy malevolent gate.O 88 Stars of the heaven... Shine!Urano Metria!

Lucy Heartfilia - She gained the ability to cast this spell thanks to Hibiki, who transferred the spell into her mind through his Archive Magic. However, Hibiki only gave her a one-time casting, so she cannot use Urano Metria again unless she learns how to cast the spell properly through practice. After casting the spell, Lucy wasn't able to remember anything of what she had just done, implying that she entered into a trance of sorts in order to activate Urano Metria. Later, Lucy learned to cast the spell on her own by doubling her Magical power with help from Gemini when they took on her form. However, according to Lucy, the amount of power is still lower than the first time she used it.

Hibiki Lates - He transferred this ability to Lucy via Archive Magic, therefore knowing it himself. However, there is no evidence that he is actually capable of casting it.[2]

The name of this spell refers to the very first great Star Atlas, named Uranometria, created in 1603 by the German Lawyer and Astronomer Johann Bayer. The text's name is Graeco-Latin and means "Measuring Heaven/Measuring the Sky", like the opening stanza of the spell. The spell makes references to the 88 classical constellations, which are, like the stars mapped in Uranometria, made up of stars which are visible with the naked eye.